Alright man, this is last resort stuff right here, but it will make any white fiberglass boat look like new. I do it on mine once a year.
Buy a couple bottles of SNO BOL toilet boil cleaner. Squirt it on your boat in a small area and immediately start spreading it out evenly all over the boat with a soft deck brush. It is VERY important that you spread it out evenly
EVERYWHERE. This works so damn good, that if you miss a spot or two, it will stand out like a sore thumb and you will have to redo those areas. Wear boots and gloves when you do this. Let it sit for about 5 minutes then hose it off.
It will make your boat look like it's showroom new; HOWEVER THIS IS THE MOST IMPORTANT PART: It will remove 100% of all of your wax wherever you put it.
So, if you go this route, wax with woody wax at a minimum and a paste wax preferably. Image: http://content.etilize.com/spr/EJ/2518122.jpg
This post was edited on 11/14 at 10:15 am